RDBMS

What are the differences between a traditional RDBMS and a NoSQL database?
Ann KAsked:
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slightwv (䄆 Netminder) Commented:
The R in RDBMS is Relational.  NoSQL isn't.

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nociSoftware EngineerCommented:
think about this eqivalent:
To keep it short:

NOSQL - it's like a library, you can find any book provided you know the title/classification....  but you would have a lot of work modifying  the 3rd chapter in every book if that chapter 4 contains the word XYZ.    
Getting the whole book is easy storing it also

Relational (RDBMS): a desciption of relations.... Books have titles & multiple chapters..., every chapter has various pages with words.
Finding all books where chapter 4 contains the word  XYZ is easy here as you have a word list..., ordered by chapter... then again getting a book from this library is searching thought everything belonging to a title, then chapters then pages ...  and then ordering all output... lot of work..

Both have there merrits & pitfalls.  it will be easier to build a NOSQL database based on a RDBMS then the other way around.
(as in rdbms basicly NOSQL looks like: (Timestamp, Key, Value )   with Value being a blob.
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Mark GeerlingsDatabase AdministratorCommented:
Some examples of (non-computerized) NoSQL databases that were very common for most of the past 100 years are:
1. card catalogs at the library
2. telephone books
3. recipe files

These were all organized to solve particular tasks, and they all worked without SQL.
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